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Publication numberUS4621842 A
Publication typeGrant
Application numberUS 06/708,164
Publication dateNov 11, 1986
Filing dateMar 4, 1985
Priority dateMar 4, 1985
Fee statusPaid
Publication number06708164, 708164, US 4621842 A, US 4621842A, US-A-4621842, US4621842 A, US4621842A
InventorsLeonard J. Kowal, Albert J. Schwarz, Norman B. Wells
Original AssigneeImperial Clevite Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Releasable push-to-connect tube fitting
US 4621842 A
Abstract
A releasable push-to-connect tube fitting wherein a collet receiving the tube end is provided with longitudinally extending inner slots permitting constriction of the inner end of the collet about the tube end in the made-up condition of the fitting. The slots are sized so as to limit the constriction so as to maintain the outer diameter of the inner end of the collet greater than the minimum diameter of the confronting camming surface of the fitting body member, thereby effectively positively retaining the collet in the body member upon assembly of the fitting elements. The collet further includes an enlarged outer end exposed exteriorly of the fitting body in the made-up arrangement of the fitting for facilitated fingertip manipulation of the collet in releasing the tube from the fitting when desired. The collet is retained in the outer end of the body by constrictive deformation of the body outer end portion after installation of the inner portion of the collet therein. The constrictive deformation is effected by a suitable tool so as to define the desired inner surfaces of the body end cooperating with the collet in effecting the positive sealed connection of the tube end to the fitting.
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Claims(10)
We claim:
1. A releasable tube fitting comprising:
a body provided with a through bore, said body having an axially outer end defining a radially inner surface defining the axially outer end of said bore and including an axially outer first cylindrical portion, and an axially inwardly widening frustoconical axially inner portion; and
an annular collet for coaxially receiving the end of a tube for connection to said body, said collet defining an axis and being coaxially received in said bore outer end and having a tubular midportion, an axially outer radially outwardly turned flange axially outwardly of said body outer end and having an outer diameter greater than the diameter of the axially outer end of the bore and no greater than the minimum outer diameter of said body outer end for ease of tube release, and to allow a deforming tool to pass thereover to form said axially outer first cylindrical portion and said axially inwardly widening frustoconical axially inner portion an axially inner end radially inwardly of said frustoconical inner portion of the bore outer end and having a radially outwardly projecting camming portion, and a radially inwardly directed tube gripping portion, said collet further having at least one longitudinally extending slot at said axially inner end permitting constriction of said collet inner end as an incident of the collet being urged axially outwardly with said camming portion engaging said frustoconcial bore surface portion, the total slot width circumferentially of the collet axis being preselected to cause the minimum outer diameter of said camming portion when said inner end of the collet is fully radially constricted to be greater than the diameter of the outer end of said frustoconical bore surface portion.
2. The tube fitting of claim 1 wherein an annular seal is coaxially disposed in said bore axially inwardly of said collet inner end defining means for sealing a tube end extended axially inwardly from the collet.
3. The tube fitting of claim 1 wherein said gripping portion comprises an annular boss.
4. The tube fitting of claim 1 wherein said gripping portion comprises an annular boss defining a sharp radially inner end adapted to bite into the tube end when said axially inner end of the collet is constricted thereabout.
5. The tube fitting of claim 1 wherein said inner end of the collet is provided with a plurality of said slots, said slots being equiangularly spaced about the axis of said collet.
6. The tube fitting of claim 1 wherein said body outer end is formed of a material having a rigidity greater than that of said collet inner end.
7. The tube fitting of claim 1 wherein said collet is formed of metal.
8. The tube fitting of claim 1 wherein said body outer end is defined by metal deformed beyond its elastic limit.
9. The tube fitting of claim 1 wherein said body outer end further defines an axially inner cylindrical portion of the through bore outer end having a diameter equal to the diameter of the frustoconical surface poriton at its axially inner end, and said fitting further includes an O-ring seal radially inwardly of said axially inner cylindrical surface portion.
10. The tube fitting of claim 1 wherein said body outer end further defines an axially inner cylindrical portion of the through bore outer end having a diameter equal to the diameter of the frustoconical surface portion at its axially inner end, and said fitting further includes an O-ring seal radially inwardly of said axially inner cylindrical surface portion, the axial length of said axially inner cylindrical surface portion being greater than the cross-sectional diameter of the O-ring seal.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to tube fittings and in particular to releasable push-to-connect tube fittings.

2. Description of the Background Art

In one form of releasable push-to-connect tube fitting, a collet is received within an end portion of the fitting body. The tube end is coaxially inserted through the collet for effecting a sealed connection of the tube end to the fitting body.

A number of different fittings have been developed for effecting such a tube connection. Illustratively, in U.S. Pat. No. 3,909,046 of Andre Legris, a tube fitting is shown wherein a tubular collet is firstly installed in a tubular member having at its axially inner end a tapered camming surface. The collet is installed from the inner end of the tubular member and, thus, the outer end of the collet must be no bigger than the minimum diameter of the bore of the tubular member. Resultingly, as shown in the Legris patent, it is difficult to release the tube from the fitting as such release requires the forceful urging of the collet axially inwardly as by a screwdriver acting on the relatively small distal end of the collet projecting from the fitting. In addition, the tubular member must be fixedly secured in the fitting body, thereby increasing the cost of the fitting and further providing a potential area of failure of the fitting should the tubular member not remain fixedly secured in the body.

Another collet-type tube coupling is illustrated in U.S. Pat. No. 4,178,023 of John D. Guest. As shown therein, the collet is provided with slots, permitting the inner end of the collet to be sufficiently compressed so as to permit it to pass axially inwardly through the small end of a tapered bore of the fitting body. This permits the collet to be assembled from outside the fitting body and permits the outer end of the collet to have a relatively large turned flange so as to permit facilitated axially inward movement of the collet in releasing the tube end from the fitting when desired. This design, however, has the serious disadvantage of potentially permitting the outward movement of the collet when the fitting is subjected to substantial fluid pressures as it is the resiliency of the slotted end of the collet which is retaining the collet in the fitting. The chance of such failure is further increased where the tubing is of relatively soft material, such as synthetic resins, which offer relatively small resistance to radial inward constriction of the slotted collet end.

SUMMARY OF THE INVENTION

The present invention comprehends an improved releasable push-to-connect tube fitting eliminating the problems of the above discussed prior art devices in a novel and simple manner.

More specifically, the invention comprehends an improved fitting wherein the collet is provided with longitudinal slots at the inner end, but wherein the constrictibility of the slotted end is limited so as to prevent constriction to less than the minimum diameter of the collet bore, thereby effectively positively retaining the collet in the bore against blowout as from high pressure and the like in the fitting.

The invention further comprehends the provision of such a fitting wherein the collet is provided with a relatively large outer end for facilitated inward urging of the collet to release the tube from the fitting when desired.

The invention comprehends the provision of such a fitting wherein the body member defines an outer end portion which is constricted about the collet subsequent to the insertion of the collet coaxially thereinto, thereby effectively retaining the collet within the body end.

The invention comprehends that the body end be formed of a material having a rigidity substantially greater than the rigidity of the constrictible collet inner end, whereby the collet is effectively positively retained in the body end against blowout and the like.

In the illustrated embodiment, the body end is constricted as by swaging thereof subsequent to the installation of the collet therein.

The body end defines a frustoconical camming surface engaging the inner end of the collet for effecting constriction thereof tightly about the tube end inserted therethrough in effecting the desired sealed connection of the tube end to the body.

The collet may be provided with an inwardly projecting gripping portion at the inner end thereof for effectively positively engaging the tube end in the made-up arrangement of the fitting for further improved retention of the tube end in sealed connection to the body.

In the illustrated embodiment, the outer end of the collet is defined by a radially outturned flange. The flange has a maximum outer diameter no greater than the minimum outer diameter of the body end portion, but substantially greater than the inner diameter of the body end portion so as to provide for faciliated manipulation of the collet from externally of the body.

The fitting of the present invention is extremely simple and economical of construction, while yet providing the highly desirable features discussed above.

BRIEF DESCRIPTION OF THE DRAWING

Other features and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing wherein:

FIG. 1 is a side elevation of a fitting embodying the invention showing a portion of a tube end connected thereto;

FIG. 2 is an exploded diametric section of the fitting;

FIG. 3 is a diametric section illustrating a first step in the forming of the body end portion to retain the collet in association therewith;

FIG. 4 is a diametric section illustrating a final step in the constriction of the body end portion; and

FIG. 5 is a diametric section illustrating the arrangement of the made-up fitting with the tube end connected thereto.

DESCRIPTION OF THE PREFERRED EMBODIMENT

In the exemplary embodiment of the invention as disclosed in the drawing, a tube fitting generally designated 10 is shown to comprise a body 11, a collet 12, and a seal 13.

The body is provided with a through bore 14. The body defines an axially outer end 15 in turn defining a radially inner surface 16. Surface 16 defines the axially outer end of the through bore 14, and includes an axially outer, first cylindrical portion 17, an axially inwardly widening frustoconical, axially inner portion 18, and an axially inner cylindrical portion 19.

In the illustrated embodiment, the outer end 15 of body 11 is formed by suitable means, such as swaging element 20. Thus, as seen in FIG. 2, body 11 is originally provided with a right circularly cylindrical tubular end 21 defining the outer end of bore 14. Swaging tool 20 is engaged with the tubular body end 21, as illustrated in FIGS. 3 and 4, so as to deform the tubular end 21 so as to define the desired stepped configuration of the fitting outer end portion 15 illustrated in FIGS. 1, 4, and 5.

More specifically, the inner swaging surface of the tool 20 is defined by an outer right circularly cylindrical surface portion 22 having a diameter equal to the desired outer diameter of the outer end 23 of the body portion 15. The tool further defines a frustoconical inner surface 24 arranged to form the frustoconical midportion 25 of the body outer end 15.

As further seen in FIGS. 3 and 4, body 11 defines a radial shoulder surface 26 disposed to be abutted by the axially inner end 27 of the tool 20 at the end of the forming operation. The cylindrical inner surface 28 of the undeformed body end 21 extends axially inwardly of the plane of surface 26. Thus, the cylindrical inner portion 19 of the surface 16, as seen in FIG. 4, is unconstricted and remains at the diameter of the inner surface 28 prior to deformation of the body end by the tool 20.

As seen in FIG. 5, the seal 13 comprises an O-ring which is disposed within the surface portion 19 and in abutment with a radial shoulder surface 29 at the axially inner end of the surface 19.

As further illustrated in FIG. 5, the body bore 14 includes a radially enlarged cylindrical midportion 30 having a diameter substantially equal to the outer diameter of the tube T to be connected to the fitting, permitting the distal end 31 of the tube to be received therein in the made-up condition of the fitting, as shown in FIG. 5. In the made-up condition, O-ring 13 is radially compressed between the tube end and surface 19 so as to provide a seal of the tube end to the body 11.

As best seen in FIG. 2, collet 12 is defined by a tubular midportion 32, an axially outer, radially enlarged end 33, and an axially inwardly, radially inwardly and outwardly enlarged end 34. The inner diameter of portions 32 and 33 is substantially equal to the outer diameter of the tube T to be connected, as illustrated in FIG. 5.

Outer end 33, in the illustrated embodiment, is defined by an outturned flange having an outer diameter which is no greater than the diameter of tool surface portion 22, as illstrated in FIG. 4.

Inner end 34 of the collet is defined by a radially outwardly projecting boss 35 and a radially inwardly projecting boss 36. The outer diameter of boss 35 is greater than the minimum diameter of the frustoconical surface portion 18 of bore surface 16.

Radially inwardly projecting boss 36 is defined by an inner sharp edge 37 adapted to bite into the outer surface of the tube end in the made-up arrangement of the fitting, as illustrated in FIG. 5.

The collet is further provided with at least one, and in the illustrated embodiment, a plurality of longitudinally extending slots 38. In the illustrated embodiment, the slots are equiangularly circumferentially spaced about the axis 39 of the collet. The circumferential extent of the slots is preselected so that when the inner end of the collet is constricted so as to close the slots at their inner ends 40, as illustrated in FIG. 4, the outer diameter of the boss 35 remains larger than the minimum diameter of the frustoconical surface 18. Thus, the collet is effectively positively prevented from being withdrawn from the body end 15 upon completion of assembly of the fitting, as illustrated in FIG. 4. Such constriction of the collet inner end may be effected by pressure forces acting within the fitting tending to urge the collet and tube end axially outwardly so as to urge the collet outer boss 35 forcibly against the frustoconical portion 18 of the body surface 16, as illustrated in FIG. 5. When fluid pressure is present within the fitting, the O-ring 13 would tend to be urged against the collet end 34 so as to effect the seal between the tube end and body, as discussed above.

As further illustrated in FIG. 5, the urging of the collet end portion 35 against the frustoconical surface 18 tends to constrict the slotted end of the collet so as to urge the sharp-edged inner boss 36 radially into the surface of the tube end, thereby assisting in the positive retention of the tube end in the made-up connection of the tube end to the fitting.

As indicated briefly above, the body end 21 is caused to have a rigidity greater than the rigidity of the collet material so as to effectively positively retain the collet in the body end when assembled, as seen in FIGS. 1, 4, and 5. In the illustrated embodiment, both the body and collet are formed of metal and provide high strength positive retention of the tube end in sealed connection to the fitting, as discussed above.

By virtue of the relatively large radial configuration of the collet end 33, fingertip manipulation of the collet may be readily effected, avoiding the need for the use of screwdrivers and the like, as required in the fittings of the prior art.

The tube fitting of the present invention is extremely simple and economical of manufacture, and utilizes only three parts in effecting the high strength, improved positive sealing of the tube end to the fitting. The fitting is adapted to resist blowout against relatively high pressures, and as discussed above, provides for facilitated tubing release by fingertip engagement with the exposed relatively large end 33 of the collet.

The foregoing disclosure of specific embodiments is illustrative of the broad inventive concepts comprehended by the invention.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2389233 *Jul 28, 1942Nov 20, 1945Irving CowlesCoupling nut for flanged tubing conduits
US3150886 *May 23, 1961Sep 29, 1964Briegel Theodore WElectrical conduit connector
US3266823 *Jun 21, 1965Aug 16, 1966Armco Steel CorpWellhead equipment with abutting slips
US3653689 *May 6, 1970Apr 4, 1972Legris SocReleasable coupling for fluid carrying tubes
US3909046 *Mar 13, 1974Sep 30, 1975Legris France SaConnector for fluid conduits, such as semi-rigid pipes
US4005883 *Aug 1, 1975Feb 1, 1977Guest John DTube couplings
US4021062 *Feb 19, 1975May 3, 1977Automatisation-SogemoCoupling assemblies
US4030741 *Jan 20, 1975Jun 21, 1977Harvey Hubbell, IncorporatedCord grips
US4178023 *Feb 6, 1978Dec 11, 1979Guest John DCouplings for tubes
GB379413A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4685706 *Dec 31, 1985Aug 11, 1987Clevite Industries Inc.Releasable push-to-connect tube fitting
US4836580 *Mar 1, 1988Jun 6, 1989Scepter Manufacturing Company LimitedConduit connector
US5584513 *Nov 10, 1994Dec 17, 1996Parker-Hannifin CorporationPush in plastic tube fitting
US5683120 *Jun 3, 1996Nov 4, 1997Parker-Hannifin CorporationReleasable push-to-connect tube fitting
US5927975 *Jan 24, 1997Jul 27, 1999Esrock; Bernard S.Fitting for dental syringe tip
US6238211Sep 21, 1999May 29, 2001Bernard S. EsrockFitting for dental syringe
US6250921Dec 22, 1999Jun 26, 2001Bernard S. EsrockFitting for dental syringe
US6283750May 30, 2000Sep 4, 2001Bernard S. EsrockMethod of connecting a syringe tip to a dental syringe hand piece
US6319001Mar 4, 1999Nov 20, 2001Bernard S. EsrockFitting for dental syringe tip
US6595558 *May 25, 2001Jul 22, 2003Usui Kokusai Sangyo Kaisha LimitedHigh-pressure metal pipe with connection head, method of forming the head and connection washer for the connection head
US6749233Jun 8, 2001Jun 15, 2004Hitachi Metals, Ltd.Sleeve-type pipe joint
US6948921Aug 23, 2000Sep 27, 2005Leybold Vakuum GmbhVacuum pump comprising an outlet
US7004844 *Oct 3, 2003Feb 28, 2006Timken Us CorporationClearance damping device for a telescoping shaft assembly
US7100950 *May 17, 2004Sep 5, 2006Siemens AgConnecting element
US7118136Apr 22, 2004Oct 10, 2006Hitachi Metals, Ltd.Sleeve-type pipe joint
US7458964Nov 1, 2006Dec 2, 2008Medical Technologies Of Georgia, Inc.Catheter movement control device
US7963078 *Jun 5, 2008Jun 21, 2011Sorkin Felix LCompression cap sheathing lock
US7985217Sep 22, 2008Jul 26, 2011Medical Technologies Of Georgia, Inc.Catheter movement system
US8517431 *Jan 19, 2010Aug 27, 2013Viega Gmbh & Co. KgFitting for thick-walled pipes and method for its production
US8888140Feb 18, 2010Nov 18, 2014Parker-Hannifin CorporationHose fitting
US9234611May 21, 2013Jan 12, 2016Viega Gmbh & Co. KgFitting for thick-walled pipes and method for its production
US20040195831 *Apr 22, 2004Oct 7, 2004Hitachi Metals Ltd.Sleeve-type pipe joint
US20040232694 *May 17, 2004Nov 25, 2004Siemens AktiengesellschaftConnecting element
US20050075174 *Oct 3, 2003Apr 7, 2005Timken Us CorporationClearance damping device for a telescoping shaft assembly
US20070102242 *Nov 4, 2005May 10, 2007Sky Climber, LlcPowered controlled acceleration suspension work platform hoist system
US20080103464 *Nov 1, 2006May 1, 2008Mosler Theodore JCatheter movement control device
US20090043287 *Sep 22, 2008Feb 12, 2009Mosler Theodore JCatheter movement system
US20090137986 *Dec 1, 2008May 28, 2009Medical Technologies Of Georgia, Inc.Catheter movement control device
US20100207387 *Feb 18, 2010Aug 19, 2010Parker-Hannifin CorporationHose fitting
US20120001414 *Jan 19, 2010Jan 5, 2012Viega Gmbh & Co. KgFitting for Thick-Walled Pipes and Method for Its Production
CN101858468BApr 7, 2009Apr 17, 2013中国人民解放军后勤工程学院Slotted head fast connector
EP0331116A1 *Feb 28, 1989Sep 6, 1989SCP and Company Limited PartnershipConduit connector
EP1143186A1 *Apr 2, 2001Oct 10, 2001Sabras S.r.l.Pipe fitting
WO2001038742A1 *Aug 23, 2000May 31, 2001Leybold Vakuum GmbhVacuum pump comprising an outlet
WO2001038771A1 *Aug 23, 2000May 31, 2001Leybold Vakuum GmbhTransition element
Classifications
U.S. Classification285/322, 285/382
International ClassificationF16L37/092, F16L33/22
Cooperative ClassificationF16L37/0925, F16L33/227
European ClassificationF16L33/22J, F16L37/092B
Legal Events
DateCodeEventDescription
Mar 4, 1985ASAssignment
Owner name: IMPERIAL CLEVITE INC., A CORP OF PA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:KOWAL, LEONARD J.;SCHWARZ, ALBERT J.;WELLS, NORMAN B.;REEL/FRAME:004380/0357
Effective date: 19850227
Aug 18, 1986ASAssignment
Owner name: CLEVITE INDUSTRIES INC., A CORP. OF DE.
Free format text: MERGER;ASSIGNOR:IMPERIAL CLEVITE INC., A PA. CORP. (MERGED INTO);REEL/FRAME:004600/0610
Effective date: 19860615
Owner name: CLEVITE INDUSTRIES INC., A CORP. OF DE.,STATELESS
Free format text: MERGER;ASSIGNOR:IMPERIAL CLEVITE INC., A PA. CORP. (MERGED INTO);REEL/FRAME:004600/0610
Effective date: 19860615
Aug 14, 1989ASAssignment
Owner name: PULLMAN COMPANY, THE, A DE. CORP.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CLEVITE INDUSTRIES INC.,;REEL/FRAME:005165/0550
Effective date: 19890811
May 2, 1990FPAYFee payment
Year of fee payment: 4
Apr 25, 1994FPAYFee payment
Year of fee payment: 8
Jan 9, 1995ASAssignment
Owner name: CHEMICAL BANK (AS COLLATERAL AGENT), NEW YORK
Free format text: SECURITY INTEREST;ASSIGNOR:PULLMAN COMPANY, THE;REEL/FRAME:007271/0039
Effective date: 19941222
May 13, 1996ASAssignment
Owner name: IMPERIAL EASTMAN ACQUISITION CORP., NEW YORK
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PULLMAN COMPANY, THE;REEL/FRAME:007945/0273
Effective date: 19960305
Jul 19, 1996ASAssignment
Owner name: PULLMAN COMPANY, THE, NEW JERSEY
Free format text: RELEASE OF SECURITY INTEREST;ASSIGNOR:CHEMICAL BANK (AS ADMINISTRATIVE AGENT);REEL/FRAME:008194/0709
Effective date: 19960305
Apr 27, 1998FPAYFee payment
Year of fee payment: 12
Sep 5, 2000ASAssignment
Owner name: DAYCO PRODUCTS, INC., OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:IMPERIAL EASTMAN ACQUISITION CORP.;REEL/FRAME:011149/0060
Effective date: 19980228
Apr 23, 2001ASAssignment
Owner name: DAYCO PRODUCTS, LLC, OHIO
Free format text: CHANGE OF NAME;ASSIGNOR:DAYCO PRODUCTS, INC.;REEL/FRAME:011731/0874
Effective date: 20000913
Mar 11, 2002ASAssignment
Owner name: PARKER-HANNIFIN CORPORATION, OHIO
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DAYCO PRODUCTS, LLC;REEL/FRAME:012721/0884
Effective date: 20011019
May 19, 2003ASAssignment
Owner name: PARKER HANNIFIN CUSTOMER SUPPORT INC., TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:PARKER-HANNIFIN CORPORATION;REEL/FRAME:014051/0528
Effective date: 20030331